border1px($border-width = 1px, $border-color = #ccc, $border-style = solid, $radius = 0)
  position relative
  border-radius $radius
  &::after
    // 用以解决边框layer遮盖内容
    pointer-events none
    position absolute
    z-index 999
    top 0
    left 0
    // fix当元素宽度出现小数时，边框可能显示不全的问题
    // overflow: hidden;
    content "\0020"
    border-color $border-color
    border-style $border-style
    border-width $border-width
    @media screen and (max--moz-device-pixel-ratio: 1.49),
      (-webkit-max-device-pixel-ratio: 1.49),
      (max-device-pixel-ratio: 1.49),
      (max-resolution: 143dpi),
      (max-resolution: 1.49dppx)
        width 100%
        height 100%
        if $radius > 0
          border-radius $radius
    @media screen and (min--moz-device-pixel-ratio: 1.5) and (max--moz-device-pixel-ratio: 2.49),
      (-webkit-min-device-pixel-ratio: 1.5) and (-webkit-max-device-pixel-ratio: 2.49),
      (min-device-pixel-ratio: 1.5) and (max-device-pixel-ratio: 2.49),
      (min-resolution: 144dpi) and (max-resolution: 239dpi),
      (min-resolution: 1.5dppx) and (max-resolution: 2.49dppx)
        width 200%
        height 200%
        transform scale(.5)
        if $radius > 0
          border-radius $radius * 2
    @media screen and (min--moz-device-pixel-ratio: 2.5),
      (-webkit-min-device-pixel-ratio: 2.5),
      (min-device-pixel-ratio: 2.5),
      (min-resolution: 240dpi),
      (min-resolution: 2.5dppx)
        width 300%
        height 300%
        transform scale(.3333333)
        if $radius > 0
          border-radius $radius * 3
    transform-origin 0 0